Cutting tool alloy



Patented Nov. 8, 1932 GEORGE E. COULS, OF DETROIT, MICHIGAN CUTTING TOOL ALLOY No Drawing.

Steel scrap 26% Tungsten 21% (98% pure) Chromium 31. (98% pure) Cobalt 147 ,Ferro vanadium 5% (38% vanadium content) Copper 2.5%

The steel scrap, tungsten, chromium and cobalt are first introduced into the furnace or crucible and heated to a temperature of from 3200 to 3300 F. to fuse and commingle the same. The copper is then added and after an interval of from five to ten minutes the ferro vanadium is introduced. Preferabl a small amount of titanium, about 1%, is ad ed to the molten metal before pouring, after which the metal is cast either in bars or suitably fashioned tools.

The product resulting from the above process has substantially the proportion of ingredients as introduced, with the exception of a portion of the vanadium and the titanium which are removed with the slag. There is also present a small percentage of carbon. As above stated, the physical characteristics of the alloy are hardneS and unusual fineness of its cutting crystals together with toughness in the matrix which permit of forming and maintaining a keen cutting edge on the tool. Furthermore, it maintains its rigidity at fairly high temperatures which ada t it for high speed cutting operations.

hat I claim as my invention is:

An alloy comprising the following in- .Application filed February 27, 1981. Serial No. 518,918.

gredients in substantially the following pro- In testimony whereof I aflix my signature.

GEORGE R. COULS. 

